Int 2F/AX=2780h/CL=01h

Novell DOS 7 - EMM386.EXE - MULTITASKING API - SUPERVISOR MODULE

AX = 2780h.
CL = 01h (module:
Supervisor).
CH = subfunction
00h unused
Return:
CX = status (0002h) (see #02739)
01h unused
Return:
CX = status (0002h) (see #02739)
02h "Z_ModuleReg" register an OS module
EBX = module number (0005h-000Fh)
DS:EDX -> module descriptor (see #02741)
Return:
CX = status (0000h,0030h) (see #02739)
03h allocate SYSDAT memory
DX = number of ??? to allocate
Return:
CX = status (0000h,0003h) (see #02739)
04h get selector to SYSDAT
Return:
CX = 0000h (successful)
BX = selector for EMM386 data segment
EBX high word cleared
05h "Z_MoveReal" relocate segment into extended memory
DS:EDX -> descriptor parameter block
Return:
ECX = status (00h,03h,31h,32h) (see #02739)
---if successful---
parameter block filled
06h "Z_Reboot" return to real mode via triple fault
07h debugger break

Note: Calls INT 03, then INT 21/AH=02h to output a question mark 08h "X_ForeCheck" check if domain is in foreground

Return:
CX = 0000h (successful)
EBX = ??? (0 or 2)
09h register VxD with system
0Ah unload VxD hook
0Bh indicate end of initialization phase
Return:
CX = status (0002h) (see #02739)
0Ch "F_AllocWindow" allocate 4K mapping window
0Dh "F_RegisterBoot" register reboot addresses
EBX = ???
EDX = ???
Return:
???
0Eh "F_EnquireBoot" check if reboot active
Return:
CX = 0000h (successful)
BL = ???     \ or BX = 0000h
BH = ???     /
0Fh get debugging level
Return:
CX = 0000h (successful)
EBX = new value for debugging level
10h set debugging level
EDX = ???
Return:
CX = 0000h (successful)
EBX = old value of debugging level
11h installation check (documented)
Return:
CX = status
0000h if multitasker is installed
EBX = version (0100h for v1.00)
1101h if multitasker is not present
12h "F_V86BPInstall" install V86 breakpoint
DX = ???
Return:
CX = 0000h (successful)
AX = old value of ???
13h "F_V86BPRemove" remove V86 breakpoint
Return:
CX = status (0000h,003Fh) (see #02739)
AX = ???
14h "F_V86BPOffer" indicate INT 03 to be used as V86 breakpoint
EDX = linear address ??? of INT 03 instruction for breakpoint
Return:
CX = status (0000h,003Fh) (see #02739)
15h "F_LoaderCleanup" offer opportunity to clean up
BX = segment of ???
Return:
CX = 0000h (successful)
BX = segment of ???
16h "F_RegisterVxDWindow" register VxD mapping window
17h "F_RegisterPNW" register Personal NetWare information
EBX = subfunction (0-2)
Return:
CX = status (0002h if EBX>2) (see #02739)
???
18h unused
Return:
CX = status (0002h) (see #02739)

Return:
CX = status (most subfunctions)
(E)AX and/or (E)BX contain return values, depending on function

Notes: Called by DPMS.EXE and EMM386.EXE. This API is only available if AX=12FFh/BX=0EDCh returns successfully; because the request is handled on the initial trap to the memory manager caused by INT instructions, this API must be invoked with an actual INT 2F instruction instead of some simulation such as a far call to the address in the interrupt vector table

See Also:

(Table 02739) Values for Novell DOS 7 EMM386 function status: 0000h successful 0001h not implemented 0002h invalid subfunction 0003h unable to find memory 0004h invalid flag (semaphore) number 0005h flag (semaphore) overrun 0006h flag (semaphore) underrun 0007h no queue handles available 0009h no queue buffers available 000Ah queue is in use 000Bh invalid process handle 000Ch no process handles available 000Dh queue access not permitted 000Eh queue is empty 000Fh queue is full 0012h no memory handles available 0014h can't find process in process list 001Bh invalid memory handle 0023h unable to terminate process 002Ah flag set ignored 002Dh no more system flags 002Eh flag (semaphore) not in idle state 002Fh flag (semaphore) wait timed out 0030h bad module number in CL 0031h bad descriptor. Invalid value for DESC_PB_SINFO in a descriptor parameter block 0032h no free descriptors 0033h error while locking/unlocking a page 0034h error getting or setting a page 0035h no pages available 0036h invalid domain 0037h process already frozen 0038h process not frozen 0039h fork failure (no registered swaplist) 003Ah page already free 003Bh page already allocated 003Ch unable to switch tasks 003Dh attempted to free critical section which is not active 003Eh too many active critical sections 003Fh ??? 41FFh current domain is invalid, or no domain in context 42FFh domain ID is not a valid descriptor 43FFh domain creation still in progress 44FFh domain currently being deleted 45FFh task manager is busy, cannot unload it 46FFh task manager already loaded 47FFh task manager not yet loaded 48FFh cannot save/restore because prior switch not complete 49FFh console already has owner 4BFFh unsupported opcode 4CFFh 32-bit address prefix not supported 4FFFh timeout, but not on timer queue 50FFh unable to lock timer queue 53FFh unable to switch while in Global Message Mode 54FFh error while setting Global Message Mode 55FFh not in Global Message Mode 56FFh system already in Domain Message Mode 57FFh not in Domain Message Mode 58FFh unable to allocate timeout structure 59FFh unsupported video type 5AFFh function not handled by any VM 5BFFh error in Serial..Set call 5CFFh error in Parallel..Set call 5DFFh domain list overflowed 5FFFh unable to free domain while in nobuffers mode

Format of Novell DOS/OpenDOS EMM386 descriptor parameter block: Offset Size Description (Table 02740) 00h DWORD "DESC_PB_BASE" 04h DWORD "DESC_PB_LIMIT" 08h WORD "DESC_PB_SEL" 0Ah BYTE "DESC_PB_MINFO" 0Bh BYTE "DESC_PB_SINFO"

See Also: #02741


Format of Novell DOS/OpenDOS EMM386 module descriptor:

Offset  Size    Description     (Table 02741)
00h 12 BYTEs   descriptor parameter block (see #02740)
0Ch    DWORD   -> module entry point

Note: For function "Z_ModuleReg", only DESC_PB_SEL and the module entry point need to be initialized before calling EMM386

See Also: #02740

Category: Memory Management - Int 2Fh - N

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